<!--emphasize <Canvas-->
<Canvas
    xmlns="http://schemas.microsoft.com/client/2007"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <!--emphasize <Canvas-->
  <Canvas Height="50" Width="50" Canvas.Left="30" Canvas.Top="30"
      Background="blue"/>
  
  <!--emphasize <Canvas-->
  <Canvas Height="50" Width="50" Canvas.Left="130" Canvas.Top="30"
      Background="red"/>
  <!-- emphasize </Canvas> -->
</Canvas>
